PHPUnit 4 Annotations

Code
<?php

class Annotation1Test extends PHPUnit_Framework_TestCase
{
    private static 
$prop;
    
    
/**
     * @before
     */
    
public function beforeTests()
    {
        
self::$prop += 2;
    }
    
    
/**
     * @after
     */
    
public function afterTests()
    {
        
// teardown after every test
        
self::$prop--;
    }
    
    
/**
     * @afterClass
     */
    
public static function cleanUpTestClass()
    {
        
self::$prop null;
    }
    
    
/**
     * @beforeClass
     */
    
public static function setUpTestClass()
    {
        
self::$prop 4;
    }
    
    public function 
testIsAwesome()
    {
        
$this->assertEquals(6self::$prop);
    }
    
    public function 
testIsAlsoAwesome()
    {
        
$this->assertEquals(7self::$prop);
    }
     
    public function 
testLastButNotLeast()
    {
        
$this->assertEquals(8self::$prop);    
    }   
}
Result
Time: 533 ms, Memory: 2.00MB

OK (3 tests, 0 assertions)
Used Versions
PHP 7.1, Zend 3.0, Symfony 3.2, Laravel 5.2, PHPUnit 5.6, Doctrine 2.6